diff --git a/porting/examples/linux/main.c b/porting/examples/linux/main.c
index 9aade75aa..86b6fb955 100644
--- a/porting/examples/linux/main.c
+++ b/porting/examples/linux/main.c
@@ -19,6 +19,7 @@
 
 #include <stdbool.h>
 #include <stdint.h>
+#include <stdlib.h>
 
 #include <pthread.h>
 #include "nimble/nimble_npl.h"